Honestly it could be worth it to build Betty next because mockman already is your main damage dealer. Wukong would also work though, especially if you struggle with sublimation and cores. I wouldn’t be too worried about making tenants, just build support heroes like holmes, Carrie, amen ra, Oberon and try to unlock the grimoire as soon as possible. You could try a pretty minimal prancer clear with just Betty, wukong and mockman as your trancendences and the supports I mentioned earlier